Precious Metal Powder Recovery Through Vibrating Sieving

Recovering gold, silver and platinum group metals from fusion residues takes more than milling the slag. Once solidified residues are crushed or milled, the material is a mix of valuable metal particles, fine ash and dust. A well-designed sieving and classification step separates those fractions, raises recovery and limits airborne dust. With high-value powders, how much material stays inside the equipment also matters.

Why Sieving Matters in Precious Metal Recovery

After milling, metal particles are spread through a much larger volume of fine ash. Without effective classification, the smallest metal particles can stay in the dust fraction and be lost. A properly selected vibratory sieve separates the milled material by size, so metal-rich fractions are collected for refining while ash is handled separately. The result:

• Higher recovery of valuable particles
• Metal-rich fractions separated from ash
• Lower losses of valuable material
• Recovered material ready for refining
• A cleaner processing area
• Less uncontrolled dust

Classifying Fine Metallic Particles

Screen opening depends on the smallest particle size you need to recover. Capacity, density, abrasiveness, size distribution and the upstream mill all influence sieve selection. Unlike bulk mineral screening, precious metal work often involves small quantities of very valuable material, so separation efficiency and hold-up inside the machine are critical.

Low-Retention Sieving for High-Value Powders

Even a little powder left in a sieve can be a significant loss. Low-retention, zero-gap sieve designs minimize internal gaps and ledges where powder collects, so more material discharges and is recovered after every batch.

Direct Integration With the Mill

The sieve can be mounted directly after the mill so milled material goes straight to classification:

Fusion residue → crushing/milling → vibratory sieving → metal fraction recovery → refining

This reduces intermediate handling. Feed hoppers, screw feeders, vacuum conveying, collection containers and dust collection can be added.

Controlling Fine Ash and Dust

Milling dry residues creates fine, easily airborne ash. An enclosed sieve with dust extraction keeps it out of the work area, reduces manual contact with material and makes housekeeping easier.

Integrated Recovery Systems

TiERMAX combines milling, controlled feeding, vibratory classification, enclosed conveying, dust collection and product recovery into one coordinated process, with attention to low retention, containment, easy cleaning and recovery of fine particles.

The Results

Combined with low-retention equipment and enclosed handling, vibratory sieving improves recovery of fine precious metal particles while keeping ash and dust under control, for higher yield, cleaner operation and easier refining.

Need a Precious Metal Sieving Solution?

Send us your material characteristics, particle size targets, milling process, throughput and space constraints, and we will configure a sieving and recovery system for U.S. refiners and recyclers.